Dynarex LabChoice Cryogenic Tubes are designed to safely store and transport biological materials in freezing temperatures. These durable plastic Tubes feature a self-standing design for optimal stability and convenient storage. The externally-threaded Tubes are equipped with a screw cap with silicone gasket for a secure seal. Dynarex Cryogenic Tubes feature a white writing panel for easy labeling and clear graduation marks for accurate measurement.   25 per pack, 10 packs per box, 4 boxes per case